package com.ruoyi.framework.interceptor.impl;

import cn.hutool.core.util.StrUtil;
import cn.hutool.http.HttpUtil;
import com.alibaba.fastjson2.JSON;
import com.ruoyi.common.annotation.RepeatSubmit;
import com.ruoyi.common.constant.CacheConstants;
import com.ruoyi.framework.interceptor.RepeatSubmitInterceptor;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.data.redis.core.BoundValueOperations;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.stereotype.Component;
import org.springframework.web.util.ContentCachingRequestWrapper;

import javax.servlet.http.HttpServletRequest;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.HashMap;
import java.util.Map;
import java.util.concurrent.TimeUnit;

/**
 * 判断请求url和数据是否和上一次相同，
 * 如果和上次相同，则是重复提交表单。 有效时间为10秒内。
 *
 * @author ruoyi
 */
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor {
    public final String REPEAT_PARAMS = "repeatParams";

    public final String REPEAT_TIME = "repeatTime";

    // 令牌自定义标识
    @Value("${system.token.header}")
    private String header;

    @Autowired
    private RedisTemplate redisTemplate;

    @SuppressWarnings("unchecked")
    @Override
    public boolean isRepeatSubmit(HttpServletRequest request, RepeatSubmit annotation) throws IOException {
        String nowParams = "";
        if (request instanceof ContentCachingRequestWrapper) {
            ContentCachingRequestWrapper repeatedlyRequest = (ContentCachingRequestWrapper) request;
            nowParams = HttpUtil.getString(repeatedlyRequest.getInputStream(), StandardCharsets.UTF_8, false);
        }

        // body参数为空，获取Parameter的数据
        if (StrUtil.isEmpty(nowParams)) {
            nowParams = JSON.toJSONString(request.getParameterMap());
        }
        Map<String, Object> nowDataMap = new HashMap<String, Object>();
        nowDataMap.put(REPEAT_PARAMS, nowParams);
        nowDataMap.put(REPEAT_TIME, System.currentTimeMillis());

        // 请求地址（作为存放cache的key值）
        String url = request.getRequestURI();

        // 唯一值（没有消息头则使用请求地址）
        String submitKey = StrUtil.trimToEmpty(request.getHeader(header));

        // 唯一标识（指定key + url + 消息头）
        String cacheRepeatKey = CacheConstants.REPEAT_SUBMIT_KEY + url + submitKey;

        BoundValueOperations<String, Map<String, Object>> ops = redisTemplate.boundValueOps(cacheRepeatKey);
        Map<String, Object> sessionMap = ops.get();
        if (sessionMap != null && (sessionMap.containsKey(url))) {
            Map<String, Object> preDataMap = (Map<String, Object>) sessionMap.get(url);
            if (compareParams(nowDataMap, preDataMap) && compareTime(nowDataMap, preDataMap, annotation.interval())) {
                return true;
            }
        }
        Map<String, Object> cacheMap = new HashMap<>();
        cacheMap.put(url, nowDataMap);
        ops.set(cacheMap, annotation.interval(), TimeUnit.MILLISECONDS);
        return false;
    }

    /**
     * 判断参数是否相同
     */
    private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap) {
        String nowParams = (String) nowMap.get(REPEAT_PARAMS);
        String preParams = (String) preMap.get(REPEAT_PARAMS);
        return nowParams.equals(preParams);
    }

    /**
     * 判断两次间隔时间
     */
    private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap, int interval) {
        long time1 = (Long) nowMap.get(REPEAT_TIME);
        long time2 = (Long) preMap.get(REPEAT_TIME);
        return (time1 - time2) < interval;
    }
}
